This. And a wall. And mass deportations. And end birthplace citizenship.
And the corollary to the argument should be:
End .gov subsidized college tuition and loans, so the people ill-suited for tertiary education, but go anyway due to societal expectations, will be forced into the labor market to fill the high-skill jobs any illegals were filling, instead of working at Starbucks trying to pay off a six-figure student debt with their worthless path-of-least-resistance humanities/arts degree. And colleges/universities will be forced to compete for students with the actual high-pay STEM majors, which will lead to a new scientific, engineering, and industrial renaissance, improving the U.S. global trade balance with high-tech, high-skill, and high value-add/margin products.
And to end most all welfare and fraudulent SSI benefits, which will force the multi-generational urban poor into the low-skill jobs any illegals were filling in places like agriculture, meat packing etc. This will reduce the crime rate in cities, will re-invigorate demographic trends to two-parent families, and probably also reduce the white-flight/suburban-sprawl issues liberals hate so much too. Although they tend to bitch and whine about "gentrification" just as much, because honestly, they're never happy, and there's no point in ever worrying about what they want as long as you can defeat them politically...
Wages will rise due to hiring competition, but this will be offset if not completely swamped by reductions in tax burdens due to the ending of welfare, and the new workers now paying income taxes. In theory, (don't laugh...
) assuming that the adults remain in charge politically, peoples wages will be higher, the .gov will be taking less of it on average per-capita and per-business, yet have more money for "muh roads"...
And teens, retirees, and people in their early 20's can repopulate minimum wage service sector jobs like retail stocking and fast food again...
Mexico will be forced to address their version of "win-lose" capitalism, corruption, and much more endemic and institutionalized racism (the gap between white-Spaniards and brown-Indian Mexicans is much greater there, and largely ignored) in the face of American "win-win" capitalism, because they can no longer use America as a safety-valve to give everyone who desires change and a better life somewhere else to go and conveniently send money home at the same time.
And whatever jobs still go unfilled because all the illegals were gone... well, don't we have a thread every other week here that there's going to be a bunch of jobs eliminated by robot cars and trucks and other automation in the coming decade or two? Obviously, jobs and economies aren't zero-sum games, but it would be nice if there were some buffer of unmet labor need to lessen that blow...